Magneto.



E. S. EUFF MAGNETG.

ummyrzos rum Mum, ma.

1,066,729 Patented July 8, 1913.

2 SHEETS-SHEET 1.

' casing.

EDWARD S. HUIF, OF DETROIT, MICHIGAN, ASSIGNOR TO HENRY FORD, OF DETROIT IMICHIGAN.

MAGNETO.

Application filed March 2, 1908. Serial No. 418,811.

To all whom t may concern.- l

lle it Linownthat I, Emmen S. HUFF, a citizen of lthe ni'ted States of America, residiii at 'Detroi-t,`in 'the county off Wayne and iftate ofMichigan, have invented certain new and useful Improvements -in Magnetos, df which the following is'a specification, reference being had therein to the accompanying drawings. My ii'ivention relates to electric Vigniters fo ipse withinternal combustion engines a d iii-'connection therewith to a magneto electric gel'nerator for generating the ignit-` ing current, the object of theinvention be- :ing to devise means best adapted vfrom a. commercial point of view to the transporta-V tion style of engine such as the inulti-cylinder Iengines of 'automobiles and like vehicles where it vis most desirable to have few and simple parts which when once properly adjusted require no further adjustment or marinai operation and therefore can be placed together vwith the eiigine and drive geai; in an outer moisture and dust proof To this end my invention embodiesV a magneto electric generator of the general type in which the fly Awheel of theengine constitutes the motor and which generates at the Anormal speed of the engine an alternating current of sufficiently high maximum intensity to produce an effective spark in the secondary .of an induction apparatus and which is organized to'generate the current at such a high frequency that a maximum current wai-'e will always be impressed upon the igniting circuit in the interval of time the circuit is closed by theoperation of a mechanical circuit breaker timed wholly with reference to the requirement of the engine and without any reference to the. time period of the current, all as more fully hereinafter described and shown in the accoinlianying drawings, in which- `Figure l1 is a sectional elevation sln'iwing part of the engine and thefly wheelC with my magneto generater combined therewith; Fig. 2 is an elevation 0f the fly wheel and of the permanent magneto secured thereto and Fig. 5i is a diagrammatic representation of the sparking device as Varranged for a four-cylinder. engine.u

As indicatedby reference letters in the drawing, 1 represents the crank shaft of the engine, 2 one of the hearings in which it. is journaled, 3 the crank casing and 4 the Specification of Letters Patent.

./16 which are co Patented July-8, 19

fiy wheel, all the parts being of lwell knli'iwn y construction and o-pera`tion. :i Y

The ily wheel carries a inultipolar -eld magnet composed of one or more hard steel disks -5. substantially of the diameter .of the Hy wheel and radially divided from the cem tral portion outwardly into separate perinanently magnetized single pole limbs G of considerable length and forming a circular range of alternate positive and negative tield poles 7. The central portion ofthe disks integrally unites the limbs at their inner ends and forms a hub 8 of suitable size for the support of the magnet; it is apertured to engage with the hub of the ily Wheel and is directly secured thereto while the limbs are magnetically insulated therefrom by an air gap 9 and firmly secured thereto by suitable noniiiag1'ietic fastenings 10.

In juxtaposition to the multipolarveld on the side toward the crarik` casing an armature is provided which consists of a magi netically continuous ironring 13 provided with bracket extensions 111 byI means -of which it is secured to the crank casing'. To this ring are secured a lseries of softv iron cores 15 corresponding tothe magnetic vpoles-- of the field and provided with pole'ple'ces 7 and provided with peripheral flanges' 17 unter-'parts of the'heldj poles f extending outwardly over thesaine 'The i cores are provided with-ge-nerating'coils 18 which are connected `in` series lwith each other into the external circuits 'of the gener-y ator- I V i The magnetic gei'ierator being constructed as shown and described it will be understood that in the normal operation of an internal combustion engine of the kind used on self'- propelling vehicles in wliichtliecrank shaft revolves at fa relatively ihigh speed, the v rapid changes of t-lie magncticliux in the generator will result in generating an alter hating currentofhigh intensity and of very rapid alternation and in utilizing this current for jump spark ignitionpany of' the known means applicableto work in connec# tion with primary or secondary battery curl rents may be used. l preferalily use tlie'arrangement Ishown in Fig. 3 in iliagraiii which shows it as applied toa four cylinder engine and wherein lf) and 30 represent the leads from the generators, 2l a primary battery in a shunt around the generator adapted lo supply the cui-'rent for starting '32 a condenser in shunt around said contacts, 3,3 the spark plugs and 34 the second-4 aries of the induction coils including the spark plugs. The electrical connections between the'ditterent parts are conventionally represented in the diagram but itwill be nmlerstood that as usual in the installation of these devices the engine cylinders and frame will forni part of the circuits where it is more 'convenient to do so. The priniaries of the induction coils are ar ranged in parallel and the circuit breaker being included in the main circuit of the generator opens and closes the circuit siccessively through the primaries in the order in which the spark is required and since the alternating current waves of the generator succeed each other at shorter periods of time than the `interval of time between the clos ing and opening thecircuit by the circuit breaker, there 'will always be a maximum current wave passing through the circuit and at this moment the magnet of the interruptor which lis in series with the circuit breaker will attract the contact 3 0' and thus cause a rapid interruption of the current at the time of the passage of the maximum current wave and as a result a secondary current of maximum in tens-ity will be generated in the. secondary for the production of the spark. ltu'ill bc seen from this operation that the magneto and the battery form interchanging sources ot electricity with one and the same apparatus, merely by throwing the switch and the timingr of the spark is acconqilished with either source by the rotary adjustment of the contactvr vcarry-ing` member Q4 through suitable connection under the contro-l of the operator. To make the tinunguniform for all the cylinders,

the number of polesl of the ield magnet of the generator ,must he an exact multiple of that of the engine cylinders and large enough to produce a current ot suoli high frequency that a maximum curint wave will always pass through the igniting circuit in the interval in which it is closed.

MyA construction of magiloto-generator `can be applied to most any kind of explosive engine of the transportation type; it. requires buta hunted space and as there is nothing that would need adjusting or oileasing usually provided for the-engine and drive mechanism. It adds butlittle extra weight to the `tiy-vvheel and under no cir cumstanees can it effect its balance since the magnet is in symmetrical relation thereto and the magnetic stress is Aequally distributed and active only through very small fraction of time during veach revolution While at the same time the range for timing the spark is unlimited.

that I claim as my invention is 1. In an electric igniting device Afor explosive engnes a iiy-Wheel 'magneto comprising a stat-ionarycircpillar Jseries of b'obhins wound with a generating conductor and n'iounted on the engine frame adjacent 'to the. fly-wheel, a multipolar field magnet on the (ipv-wheel consist-ing of a permanently magnetized disk of steel of a diameter equal to that 'of the fly-wheel and centrally apertured, said disk composed of laniin and radially divided from its central portion outwardly into separate single,V pole limbs integrally united at their inner ends with the undividedcentral portion of the disk, a tty-wheel provided with a central portion forming a seat for the central portion ot the disk and to which the same is secured and with an outer portion forming an open space between it and the limbs of the magnet, means securingeach limb separately to said outer portion at an interval therefrom and pole pieces mounted on the ends of the bobbins adjacent the poles of the field magnet and provided with ltlanges overlying the outer end faces thereof..

2..In au -electric igniting device for explosive engines, a iiy-wheel" magneto comon the fly-wheel adjacent to the engine vframe and consisting of a permanently magnetized steel disk composed of superposed lamin radially divided fronrits central portion outwardly into separatesingle .pole limbs integrally united at their `inner ends to the undivided inner portion of the disk, `said portion being apertured and secured ily-wheel neardl ,ir outer ends, and a circu` lar series of hobbinsn stationarily mounted on the engine frame iii'nductive proximity to the poles of the magnet, said bobbins pro- .vided lwith pole pieces conforming to the sides and ends of the polar ends of the limbs of the magnet.

in presence of two witnesses. C#

EDI/VARI) S. HUFF.

`Wituesses Y C. It. S'rIcKNsn Orr@ If; BAn'THEi..

ing it can be inclosed by thegeneral outer.

prisiug a multipolar field magnet, mounted upon\the\central portion of the fly-wheel and the limbs being singly secured to the Y In testimonywhereof I atiix my signature. 

